Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dee3062d077828e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 10:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23d8236b63f5f1a4c42c517405ba1c11 SHA-1: b067385890bb41dad78d73a7b6da5d525d28eb62 SHA-256: 5dee3062d077828ef3cfff1e46ff98ae98bddf8bb11f277493ca1480493398a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The primary attack pattern involves luring users to these external sites, which could host phishing content or serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/60a93530tfb88md0c5ma7l7ed3/74568293224.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3df448cc5---20815960359.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nk486v8h9emmlql8j67fcb5406/79496751784.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfc841515---giposexedudo.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/degipupur.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210831165927.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/85504172336.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/wevosowugev.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a873cac3f6262281a3497ba13a30d272/vazikagonifarokaxifas.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799f6dcc17f---60950951023.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/94146824122.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/54526414391.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/todozapudurubedatok.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/tikibagupovivizalew.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/67348158226.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd5617c25---73845563465.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c459ac3038d6ddf661a170dbe41db4ec/41199925314.pdfIn PDF document text
    • https://actorconseil.com/files/file/nemuzewavojewekuworavovuk.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f579835a---79610244192.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78805a6144---27528191650.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/mebumadezikif.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ts7vp1ohionhd7tc74mrdip5h5/27978825066.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4e6b6619---xanubepab.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/18767d73cb1c8a85d3f847135480e282/naveze.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/l9dvm7qopktuqf50asi2lkv152/26653109135.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd2c5b1ccde601074aeee49f15a2fc57/65503168692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=doorbell+ring+2+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FF 16148 bytes
SHA-256: cd704d815c59fd2b5dbff2921e14f2b915b398912d4b5ebd5dd723c87869f7e2
font_01_sfnt_off0000e2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 10544 bytes
SHA-256: f029b5c26d39b6af18e0f754d7aca5518453917f9d7adf014551ef4f763f7f6a

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